Activiti中如何跳过（自动处理）第一步的提交任务？（转载）

 

在Activiti流程设计中，为了使流程展示的更加完善，经常会将流程图的第一步任务设计成“提交任务”，例如：

申请人启动流程后，流程就会到达“提交任务”，而“提交任务”的办理人还是该申请人，这个时候就需要通过代码跳过（自动处理）该任务节点，让流程流转到下一任务节点。有两种方法可以处理这个问题。

第一种方式：在启动流程后，获取当前流程实例申请人的待办任务，并执行当前流程实例的下一步任务

Task task = null;
TaskQuery query = taskService.createTaskQuery().taskCandidateOrAssigned(empId).active();
List<Task> todoList = query.list();//获取申请人的待办任务列表
for (Task tmp : todoList) {
    if(tmp.getProcessInstanceId().equals(processInstance.getId())){
        task = tmp;//获取当前流程实例，当前申请人的待办任务
        break;
    }
}
variables.put(ProcessConstants.KEY_DEPT_LEADER_ID, employeeId);//设置下一步办理人的流程变量
taskService.complete(task.getId(),variables);

 

 

第二种方式：使用监听器处理（推荐）

spring配置文件

<bean id="processEngineConfiguration" class="org.activiti.spring.SpringProcessEngineConfiguration">
...
<!-- 添加的自定义监听器 -->
<property name="postBpmnParseHandlers">
    <list>
        <bean class="com.eazytec.common.activiti.listener.ProxyUserTaskBpmnParseHandler">
            <property name="taskListenerId" value="postTaskListener"/>
        </bean>
    </list>
</property>
...
</bean>
<!-- 在记录history之后执行的TaskListener -->
<bean id="postTaskListener" class="com.eazytec.common.activiti.listener.ProxyTaskListener">
    <property name="taskListeners">
        <list>
            <bean class="com.eazytec.common.activiti.listener.AutoCompleteFirstTaskListener"/>
        </list>
    </property>
</bean>

 

ProxyUserTaskBpmnParseHandler类

public class ProxyUserTaskBpmnParseHandler implements BpmnParseHandler {
    private static Logger logger = LoggerFactory.getLogger(ProxyUserTaskBpmnParseHandler.class);
    private String taskListenerId;
    private boolean useDefaultUserTaskParser;
 
    public void parse(BpmnParse bpmnParse, BaseElement baseElement) {
        if (!(baseElement instanceof UserTask)) {
            return;
        }
 
        if (useDefaultUserTaskParser) {
            new UserTaskParseHandler().parse(bpmnParse, baseElement);
        }
 
        UserTask userTask = (UserTask) baseElement;
        logger.info("bpmnParse : {}, userTask : {}", bpmnParse, userTask);
 
        TaskDefinition taskDefinition = (TaskDefinition) bpmnParse.getCurrentActivity().getProperty(UserTaskParseHandler.PROPERTY_TASK_DEFINITION);
 
        this.configEvent(taskDefinition, bpmnParse, TaskListener.EVENTNAME_CREATE);
        this.configEvent(taskDefinition, bpmnParse, TaskListener.EVENTNAME_ASSIGNMENT);
        this.configEvent(taskDefinition, bpmnParse, TaskListener.EVENTNAME_COMPLETE);
        this.configEvent(taskDefinition, bpmnParse, TaskListener.EVENTNAME_DELETE);
    }
 
    public void configEvent(TaskDefinition taskDefinition, BpmnParse bpmnParse, String eventName) {
        ActivitiListener activitiListener = new ActivitiListener();
        activitiListener.setEvent(eventName);
        activitiListener.setImplementationType(ImplementationType.IMPLEMENTATION_TYPE_DELEGATEEXPRESSION);
        activitiListener.setImplementation("#{" + taskListenerId + "}");
        taskDefinition.addTaskListener(eventName, bpmnParse.getListenerFactory().createDelegateExpressionTaskListener(activitiListener));
    }
 
    public Collection<Class<? extends BaseElement>> getHandledTypes() {
        List types = Collections.singletonList(UserTask.class);
        return types;
    }
 
    public void setTaskListenerId(String taskListenerId) {
        this.taskListenerId = taskListenerId;
    }
 
    public void setUseDefaultUserTaskParser(boolean useDefaultUserTaskParser) {
        this.useDefaultUserTaskParser = useDefaultUserTaskParser;
    }
}

 

ProxyTaskListener类

public class ProxyTaskListener implements TaskListener {
    private List<TaskListener> taskListeners = Collections.EMPTY_LIST;
    public void notify(DelegateTask delegateTask) {
        for (TaskListener taskListener : taskListeners) {
            taskListener.notify(delegateTask);
        }
    }
    public void setTaskListeners(List<TaskListener> taskListeners) {
        this.taskListeners = taskListeners;
    }
}

 

AutoCompleteFirstTaskListener类

public class AutoCompleteFirstTaskListener extends DefaultTaskListener {
    private static Logger logger = LoggerFactory.getLogger(AutoCompleteFirstTaskListener.class);
 
    @Override
    public void onCreate(DelegateTask delegateTask) throws Exception {
        String userId = Authentication.getAuthenticatedUserId();
        String assignee = delegateTask.getAssignee();
 
        ProcessDefinitionEntity processDefinitionEntity = Context.getProcessEngineConfiguration().getProcessDefinitionCache().get(delegateTask.getProcessDefinitionId());
 
        ActivityImpl startActivity = processDefinitionEntity.getInitial();
 
        if (startActivity.getOutgoingTransitions().size() != 1) {
            throw new IllegalStateException("start activity outgoing transitions cannot more than 1, now is : " + startActivity.getOutgoingTransitions().size());
        }
 
        PvmTransition pvmTransition = startActivity.getOutgoingTransitions().get(0);
        PvmActivity targetActivity = pvmTransition.getDestination();
 
        if (!"userTask".equals(targetActivity.getProperty("type"))) {
            logger.debug("first activity is not userTask, just skip");
            return;
        }
 
        if (targetActivity.getId().equals(delegateTask.getExecution().getCurrentActivityId())) {
            if ((userId != null) && userId.equals(assignee)) {
                logger.debug("auto complete first task : {}", delegateTask);
                new CompleteTaskWithCommentCmd(delegateTask.getId(), null, "发起流程").execute(Context.getCommandContext());
            }
        }
    }
}

 

CompleteTaskWithCommentCmd类

public class CompleteTaskWithCommentCmd implements Command<Object> {
    private String taskId;
    private String comment;
    private Map<String, Object> variables;
 
    public CompleteTaskWithCommentCmd(String taskId, Map<String, Object> variables, String comment) {
        this.taskId = taskId;
        this.variables = variables;
        this.comment = comment;
    }
 
    public Object execute(CommandContext commandContext) {
        TaskEntity taskEntity = commandContext.getTaskEntityManager().findTaskById(taskId);
 
        if (variables != null) {
            taskEntity.setExecutionVariables(variables);
        }
 
        taskEntity.fireEvent(TaskListener.EVENTNAME_COMPLETE);
 
        if ((Authentication.getAuthenticatedUserId() != null) && (taskEntity.getProcessInstanceId() != null)) {
            taskEntity.getProcessInstance().involveUser(Authentication.getAuthenticatedUserId(), IdentityLinkType.PARTICIPANT);
        }
 
        Context.getCommandContext().getTaskEntityManager().deleteTask(taskEntity, comment, false);
 
        if (taskEntity.getExecutionId() != null) {
            ExecutionEntity execution = taskEntity.getExecution();
            execution.removeTask(taskEntity);
            execution.signal(null, null);
        }
 
        return null;
    }
}